Tuning CH Hydrogen Bond-Based Receptors toward Picomolar Anion Affinity via the Inductive Effect of Distant Substituents

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CHVOJKA Matúš MADEA Dominik VALKENIER Hennie ŠINDELÁŘ Vladimír

Rok publikování 2024
Druh Článek v odborném periodiku
Časopis / Zdroj Angewandte Chemie
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.1002/ange.202318261
Doi http://dx.doi.org/10.1002/ange.202318261
Klíčová slova Anion Binding; Host–Guest Chemistry; Macrocycles; Bambusurils; NMR spectroscopy
Přiložené soubory
Popis Inspired by nature, artificial hydrogen bond-based anion receptors have been developed to achieve high anion selectivity; however, their binding affinity is usually low. The potency of these receptors is usually increased by the introduction of aryl substituents, which withdraw electrons from their binding site through the resonance effect. Here, we show that the polarization of the C(sp3)-H binding site of bambusuril receptors, and thus their potency to bind anions, can be modulated by the inductive effect. The presence of electron-withdrawing groups on benzyl substituents of bambusurils significantly increases their binding affinities to halides, resulting in the strongest iodide receptor reported to date with an association constant greater than 1013 M-1 in acetonitrile. A Hammett plot showed that while the bambusuril affinity toward halides linearly increases with the electron-withdrawing power of their substituents, their binding selectivity remains essentially unchanged.
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